build-android.sh: Android build script, using NDK standalone toolchain.

unix/build-android.sh

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+# Requires standalone toolchain (as made by
+# make-standalone-toolchain.sh from NDK).
+# See docs/Programmers_Guide/html/md_3__key__topics__building__s_t_a_n_d_a_l_o_n_e-_t_o_o_l_c_h_a_i_n.html
+# under SDK dir ("Invoking the compiler (the easy way)" subsection).
+
+# Change for other architectures or toolchains
+export CROSS_COMPILE=arm-linux-androideabi-
+make deplibs
+
+# LDFLAGS_ARCH= suppresses map file generation, which
+# causes android-ndk-r10e gcc to fault
+make MICROPY_STANDALONE=1 MICROPY_PY_JNI=1 LDFLAGS_ARCH= V=1 -B
+make MICROPY_STANDALONE=1 MICROPY_PY_JNI=1 LDFLAGS_ARCH= V=1 lib
+
+# Automatically install on device/emulator for testing
+adb push micropython /data/local/tmp